<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function change(i,j){
           
            var  num;
           num=i;
           i=j;
           j=num;
           document.write(i+"</br>"+j);
        }
      change(3,4)
      
        
      



    </script>

    
</body>
</html>